feat: Add charts API

[teeohhem]

• Utilizes renderChartConfig and CH client to query for chart data
• Implements API input schema
• Adds lots of tests

Testing Notes:

• To use swagger, go to localhost:8000/api/v2/docs
• Authorize using your access key found in localhost:8000/me
• Under the charts route, click "Try it out"
• Use example payload:

{
  "startTime": <insert valid timestamp ms>,
  "endTime": <insert valid timestamp ms>,
  "granularity": "1h",
  "series": [
    {
      "sourceId": "<insert valid sourceid>",
      "aggFn": "count",
      "where": "SeverityText:error",
      "groupBy": []
    }
  ]
}

It was easiest for me to go to the UI, create a new chart and grab the sourceid and start/end timestamps from the URL, plug it in and profit.

Note: It was apparent to me that we will need to provide at least GET support for sources, otherwise that ID is not easily obtained.

Ref: HDX-1651

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Name	Status	Preview	Comments	Updated (UTC)
hyperdx-v2-oss-app	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 2, 2025 8:00pm

[dhable]

Should there be a corresponding test to handle sql errors - e.g. what does it return when I give it a non-sql where clause when whereLanguage == 'sql'?